CN102765881A - Optical glass, preform and optical element - Google Patents

Optical glass, preform and optical element Download PDF

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Publication number
CN102765881A
CN102765881A CN201210136837XA CN201210136837A CN102765881A CN 102765881 A CN102765881 A CN 102765881A CN 201210136837X A CN201210136837X A CN 201210136837XA CN 201210136837 A CN201210136837 A CN 201210136837A CN 102765881 A CN102765881 A CN 102765881A
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composition
content
opticglass
glass
oxide compound
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永冈敦
津田哲也
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Ohara Inc
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Ohara Inc
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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/12—Silica-free oxide glass compositions
    • C03C3/14—Silica-free oxide glass compositions containing boron
    • C03C3/15—Silica-free oxide glass compositions containing boron containing rare earths
    • C03C3/155—Silica-free oxide glass compositions containing boron containing rare earths containing zirconium, titanium, tantalum or niobium

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Glass Compositions (AREA)

Abstract

The invention provides an optical glass, and a preform and an optical element made of the optical glass. The optical glass has high temperature coefficient of refractive index (dn/dT) and has the property of correcting the influence on the imaging characteristics and the like. The optical glass has low abbe coefficient (vd) and high transmissivity to visible lights and causes no adverse effect on the glass environment. By mass% of the total mass of oxides, the optical glass contains 55.0-95.0% of Bi2O3 and 4.0-35.0% of B2O3, with the temperature coefficient (20-40 DEG C) of refractive index (546.07nm) higher than 3.0*10-6(DEG C-1). The preform and the optical element are made of the optical glass.

Description

Opticglass, preform, and optical element
Technical field
The present invention relates to opticglass, preform, reach optical element.
Background technology
In recent years, being installed to projector, duplicating machine, laser printer and broadcasting increases with the use of the optical element in the optical devices such as equipment under more harsh temperature environment.For example for projector,, need to use the light source of high brightness and through the optics system of high-accuracyization in order to adapt to the requirement of miniaturized and high resolving powerization.When particularly using the light source of high brightness, because the influence of the heat that light source sends, the temperature when using the optical element that constitutes the optics system is prone to take place than cataclysm, and the situation that its temperature reaches more than 100 ℃ is also many.At this moment, when using the optics system through high-accuracyization, the change of Yin Wendu and cause the influence of the imaging characteristic of optics system etc. is become big can't be ignored, and also is difficult for optics system that imaging characteristic etc. is exerted an influence even therefore require to constitute temperature variation.
As constitute to be difficult for producing the method that causes by temperature variation, can enumerate the equable optical element that for example uses the optical characteristics that causes because of temperature variation to the optics system of the influence of imaging performance.As the opticglass that can make above-mentioned optical element, known have the for example opticglass shown in the patent documentation 1.
[patent documentation 1] TOHKEMY 2007-106611 communique
[patent documentation 2] TOHKEMY 2009-203140 communique
[patent documentation 3] TOHKEMY 2002-201039 communique
Summary of the invention
The glass that constitutes the optics system is desirably under the influence of temperature variation and can cause that optical characteristics changes as disclosed glass in the patent documentation 1.
Yet, particularly for Abbe number (v d) big, disperse little low dispersion glass, the temperature factor that has relative refractive index mostly becomes the character of negative value significantly, the specific refractory power character of step-down significantly when promptly the temperature of glass uprises.Use in the optics system of above-mentioned low dispersion glass; Even use disclosed glass in the patent documentation 1; Because it is whole that the low influence that disperses the optical characteristics change that causes because of temperature variation of glass involves the optics system, so be difficult to improve as the whole imaging characteristic of optics system etc.
Therefore, use in the optics system of above-mentioned low dispersion glass, the temperature factor that need to use relative refractive index be on the occasion of optical element, proofread and correct the influence that causes by low dispersion glass to imaging characteristic etc.As the big glass of the temperature factor of relative refractive index, can enumerate the vd that for example contains a large amount of rare earth class and surpass 30 glass here.But, when particularly above-mentioned glass being used for purposes such as projector and duplicating machine, because insufficient,, require therefore that Abbe number is littler, the glass of high dispersive (vd is below 30) so be difficult to carry out the high resolving powerization of optics system to the correction of chromatic aberation.
In addition, as the glass of the big high dispersive of the temperature factor of relative refractive index, the present known glass that contains lead that has.But, use when containing plumbous glass, big to the detrimentally affect of environment, so undesirable.On the other hand, for concerning the detrimentally affect of environment little with Si as the glass of principal constituent, because the temperature factor of relative refractive index is little, so correcting imaging characteristic etc. are insufficient.
On the other hand, discoveries such as the inventor contain more Bi 2O 3The temperature factor that the glass of composition (for example referring to patent documentation 2,3) has high relative refractive index.But, disclosedly in the patent documentation 2 and 3 contain more Bi 2O 3The opticglass of composition is difficult to being proofreaied and correct by the low influence to imaging characteristic etc. that disperses that glass causes on the contrary, and temperature variation low to visible light transmittance, that cause because of the light transmission is big, so the performance of correcting imaging characteristic etc. is also unstable.
The present invention puts in view of the above problems and accomplishes; The object of the present invention is to provide a kind of opticglass and use its preform and optical element; The temperature factor of the relative refractive index of said opticglass (dn/dT) is high, have and can carry out gauged character, Abbe number (v to the influence of imaging characteristic etc. d) low, high to visible light transmittance, and the detrimentally affect of environment reduced.
The inventor etc. are in order to solve above-mentioned problem, experimental study with great concentration repeatedly, the result finds: through and use Bi 2O 3Composition and B 2O 3Composition is regulated the content of other each compositions, even Abbe number is diminished do not use lead composition also can suitably improve the temperature factor (dn/dT) of relative refractive index, and visible light transmittance is improved, thereby has accomplished the present invention.Particularly, the present invention provides following invention.
(1) a kind of opticglass, the quality % in respect to the total mass that is scaled the oxide compound composition contains 55.0～95.0% Bi 2O 3Composition and 4.0～35.0% B 2O 3Composition, the temperature factor of relative refractive index (546.07nm) (20～40 ℃) is 3.0 * 10 -6(℃ - 1) more than, spectral transmission is 70% wavelength (λ 70) be below the 490nm.
(2) like (1) described opticglass, wherein, the temperature factor of relative refractive index (546.07nm) (20～40 ℃) is 6.0 * 10 -6(℃ -1) more than.
(3) like (1) or (2) described opticglass, wherein, in the quality % with respect to the total mass that is scaled the oxide compound composition, SiO 2The content of composition is below 35.0%.
(4), wherein, be scaled the mass ratio (SiO that oxide compound is formed like each described opticglass in (1) to (3) 2/ B 2O 3) less than 0.3.
(5) like each described opticglass in (1) to (4), wherein, in quality % with respect to the total mass that is scaled the oxide compound composition,
Li 2The content of O composition is 0～8.0%, and/or
Na 2The content of O composition is 0～8.0%, and/or
K 2The content of O composition is 0～8.0%.
(6) like (5) described opticglass, wherein, with respect to being scaled the glass total mass that oxide compound is formed, Rn 2The O composition (in the formula, Rn be selected among Li, Na, K, the Cs more than a kind) the quality sum be below 15.0%.
(7) like each described opticglass in (1) to (6), wherein, in quality % with respect to the total mass that is scaled the oxide compound composition,
La 2O 3The content of composition is 0～10.0%, and/or
Gd 2O 3The content of composition is 0～10.0%, and/or
Y 2O 3The content of composition is 0～10.0%, and/or
Yb 2O 3The content of composition is 0～10.0%.
(8) like (7) described opticglass, wherein, with respect to being scaled the glass total mass that oxide compound is formed, Ln 2O 3Composition (in the formula, Ln be selected among La, Gd, Y, the Yb more than a kind) the quality sum be below 15.0%.
(9) like each described opticglass in (1) to (8), wherein, in the quality % with respect to the total mass that is scaled the oxide compound composition, TeO 2The content of composition is below 35.0%.
(10) like each described opticglass in (1) to (9), wherein, in quality % with respect to the glass total mass that is scaled the oxide compound composition,
TiO 2The content of composition is 0～10.0%, and/or
ZrO 2The content of composition is 0～10.0%, and/or
Nb 2O 5The content of composition is 0～10.0%, and/or
Ta 2O 5The content of composition is 0～10.0%, and/or
WO 3The content of composition is 0～35.0%.
(11) like (10) described opticglass, wherein, with respect to being scaled the glass total mass that oxide compound is formed, quality sum (Ln 2O 3+ TiO 2+ ZrO 2+ Nb 2O 5+ Ta 2O 5+ WO 3+ TeO 2) be more than 0.1% below 40.0%.
(12) like each described opticglass in (1) to (11), wherein, with respect to being scaled the glass total mass that oxide compound is formed, in quality %,
The content of MgO composition is 0～35.0%, and/or
The content of CaO composition is 0～35.0%, and/or
The content of SrO composition is 0～35.0%, and/or
The content of BaO composition is 0～35.0%, and/or
The content of ZnO composition is 0～35.0%.
(13) like (12) described opticglass, wherein, with respect to being scaled the glass total mass that oxide compound is formed, the RO composition (in the formula, R be selected among Mg, Ca, Sr, Ba, the Zn more than a kind) the quality sum be below 40.0%.
(14) like each described opticglass in (1) to (13), wherein, with respect to being scaled the glass total mass that oxide compound is formed, quality sum (Ln 2O 3+ Rn 2O+RO) be more than 0.1%.
(15), wherein, be scaled the mass ratio (Ln that oxide compound is formed like each described opticglass in (1) to (14) 2O 3+ Rn 2O+RO)/Bi 2O 3Be more than 0.08.
(16) like each described opticglass in (1) to (15), wherein, with respect to being scaled the glass total mass that oxide compound is formed, in quality %,
P 2O 5The content of composition is 0～15.0%, and/or
GeO 2The content of composition is 0～10.0%, and/or
Al 2O 3The content of composition is 0～15.0%, and/or
Ga 2O 3The content of composition is 0～10.0%, and/or
Sb 2O 3The content of composition is 0～10.0%.
(17) like each described opticglass in (1) to (16), wherein, with respect to being scaled the glass total mass that oxide compound is formed, quality sum (Ta 2O 5+ GeO 2) be below 5.0%.
(18) like each described opticglass in (1) to (17), wherein, with respect to being scaled the glass total mass that oxide compound is formed, quality sum (TeO 2+ Sb 2O 3) be more than 0.01%.
(19) like each described opticglass in (1) to (18), wherein, specific refractory power (nd) is more than 1.70 below 2.20, and Abbe number (vd) is more than 15 below 30.
(20) a kind of preform that is used for attrition process and/or is used for precision press formation is formed by each described opticglass in (1) to (19).
(21) a kind of optical element grinds and forms (20) described preform.
(22) a kind of optical element carries out precision press formation and forms (20) described preform.
(23) a kind of optical element is formed by each described opticglass in (1) to (19).
(24) a kind of optical device has each described optical element in (21) to (23).
According to the present invention; Can obtain following opticglass and the preform and the optical element that use it; Said opticglass has the high character of temperature factor (dn/dT) appropriateness of relative refractive index, the character that specific refractory power further uprised when promptly the temperature of optical element uprised, Abbe number (v d) low, high and the detrimentally affect of glass environment is lowered to visible light transmittance.
Embodiment
For opticglass of the present invention, the quality % in respect to the total mass that is scaled the oxide compound composition contains 55.0～95.0% Bi 2O 3Composition and 4.0～35.0% B 2O 3Composition, the temperature factor of relative refractive index (546.07nm) (20～40 ℃) is 3.0 * 10 -6(℃ -1) more than.Through and use Bi 2O 3Composition and B 2O 3Composition, regulate the content of other each compositions, can make Abbe number (v d) diminish, improve to visible light transmittance, even and do not use lead composition also can suitably improve the temperature factor (dn/dT) of relative refractive index.Therefore; Can obtain obtaining the opticglass of following optical element, imaging characteristic that said optical element can the calibrating optical system etc. can help the high resolving powerization and the miniaturized of optics system; High to visible light transmittance, and can reduce detrimentally affect to environment.
Below the embodiment of opticglass of the present invention is elaborated, but the present invention does not receive any qualification of following embodiment, in the scope of the object of the invention, can carry out appropriate change and implement.Need to prove,, suitably omit explanation sometimes, but do not limit the purport of invention for the repeat specification part.
[glass ingredient]
The compositing range that constitutes each composition of opticglass of the present invention is described below.In this specification sheets, the containing ratio of each composition is all represented with the quality % with respect to the glass total mass that is scaled the oxide compound composition when not limiting especially.So-called here " being scaled oxide compound forms "; Be meant following composition; Promptly; The oxide compound that uses as the raw material of glass constituent of the present invention in hypothesis, composite salt, metal fluoride etc. all are decomposed during in fusion and are converted under the situation of oxide compound, are that 100 quality % represent each composition of containing in the glass with the total mass of this generation oxide compound.
< about essential composition, any composition >
Bi 2O 3Composition is for the temperature factor of the relative refractive index that increases glass significantly and reduce the composition of Abbe number.Therefore, through making Bi 2O 3The content of composition is more than 55.0%, can obtain the high and low glass of Abbe number of temperature factor of relative refractive index.In addition, through making Bi 2O 3The content of composition is more than 55.0%, can improve the specific refractory power of glass, reduces second-order transition temperature and yield-point.Therefore, for Bi 2O 3The lower limit of the content of composition in the quality % of oxide compound benchmark, is preferably 55.0%, is 58.0% more preferably, most preferably is 60.0%.On the other hand, through making Bi 2O 3The content of composition is below 95.0%, can suppress the excessive rising of temperature factor of the relative refractive index of glass, can reduce the liquidus temperature of glass.In addition, through reducing by Bi 2O 3The glass coloring that composition causes, raising transmission of visible light can reduce the temperature variation of the glass that is caused by the light transmission.On the other hand, Bi 2O 3The upper limit of the content of composition is preferably 95.0%, more preferably is 90.0%, and more preferably 85.0%, further be preferably 82.0%.Need to prove, also preferably make Bi 2O 3The content of composition is less than 75.0% scheme.Bi 2O 3Composition can use for example Bi 2O 3As raw material.
B 2O 3Composition is the liquidus temperature that reduces glass, the composition that reduces devitrification.That is, through making B 2O 3The content of composition is more than 4.0%, can obtain the glass that anti-increased devitrification resistance is high, transmission of visible light is high and attrition process property is high.Therefore, for B 2O 3The lower limit of the content of composition in the quality % of oxide compound benchmark, is preferably 4.0%, is 9.3% more preferably, more preferably greater than 10.0%, further is preferably greater than 11.0%.In addition, can make B 2O 3The content of composition is more than 12.0%, also can be for more than 12.2%, and can also be for more than 15.3%.On the other hand, B 2O 3When the content of composition was too much, the liquidus temperature of glass uprised on the contrary, and the temperature factor of relative refractive index is step-down also.Therefore, for B 2O 3The upper limit of the content of composition in the quality % of oxide compound benchmark, is preferably 35.0%, is 32.0% more preferably, most preferably is 30.0%.B 2O 3Composition can use for example H 3BO 3, Na 2B 4O 7, Na 2B 4O 710H 2O, BPO 4As raw material.
SiO 2Composition is to have the liquidus temperature that reduces glass, improve anti-increased devitrification resistance and improve the composition of effect of the transmission of visible light of glass.But, SiO 2When the content of composition was too much, the specific refractory power of glass was easy to reduce, and the temperature factor of the relative refractive index of glass is step-down also.Therefore, for SiO 2The upper limit of the content of composition in the quality % of oxide compound benchmark, is preferably 35.0%, more preferably is 25.0%, and more preferably 15.0%.Particularly consider SiO from the viewpoint of the high glass of the temperature factor that can be easy to obtain relative refractive index 2The upper limit of the content of composition is preferably 6.0%, more preferably is 4.4%, and more preferably 1.2%, the upper limit also can be 0.1%.SiO 2Composition can use for example SiO 2As raw material.
For opticglass of the present invention, preferred SiO 2The content of composition is with respect to B 2O 3The ratio of the content of composition is less than 0.30.Thus, through making the less B of effect of the temperature factor that reduces relative refractive index 2O 3Content increase relatively, can obtain high anti-increased devitrification resistance, simultaneously can be easy to obtain the temperature factor of high relative refractive index.Therefore, be scaled the mass ratio (SiO that oxide compound is formed 2/ B 2O 3) preferably less than 0.30, more preferably less than 0.20, most preferably less than 0.10.
In addition, for opticglass of the present invention, preferred B 2O 3Composition and SiO 2The composition total content is more than 4.0%.Thus, can reduce the liquidus temperature of glass, improve anti-increased devitrification resistance, and improve the transmission of visible light of glass.Therefore, be scaled the quality sum (SiO that oxide compound is formed 2+ B 2O 3) lower limit be preferably 4.0%, more preferably be 10.0%, most preferably greater than 15.0%.On the other hand, when above-mentioned total content was too much, the liquidus temperature of glass uprised on the contrary, and the temperature factor of relative refractive index is step-down also.Therefore, above-mentioned quality sum (SiO 2+ B 2O 3) the upper limit be preferably 40.0%, be 35.0% more preferably, most preferably be 30.0%.
Li 2O composition, Na 2O composition and K 2The O composition is the specific refractory power of adjusting glass and the composition of Abbe number, reduction second-order transition temperature and yield-point.But the temperature factor of relative refractive index reduces when containing more mentioned component.Therefore, for Li 2O composition, Na 2O composition and K 2The upper limit of O composition content separately in the quality % of oxide compound benchmark, is preferably 8.0%, is 4.0% more preferably, most preferably is 2.0%.In addition, for Rn 2The O composition (in the formula, Rn be selected among Li, Na, K, the Cs more than a kind) the quality sum, in the quality % of oxide compound benchmark, the upper limit is preferably 15.0%, is 10.0% more preferably, is more preferably less than 5.0%.The viewpoint of the glass particularly high from the temperature factor that can obtain relative refractive index, that transmission of visible light is high and attrition process property is high is considered, in the quality % of oxide compound benchmark, Rn 2The quality sum of O composition is preferably less than 1.0%, more preferably less than 0.5%, most preferably less than 0.1%.Li 2O composition, Na 2O composition and K 2The O composition can use for example Li 2CO 3, LiNO 3, Na 2CO 3, NaNO 3, K 2CO 3, KNO 3As raw material.
La 2O 3Composition, Gd 2O 3Composition, Y 2O 3Composition and Yb 2O 3Composition is the composition of the liquidus temperature of raising glass.Wherein, La 2O 3Composition is the composition of temperature factor that increases substantially the relative refractive index of glass.Be below 10.0% particularly, can suppress Abbe number and raise through making mentioned component content separately.Therefore, for La 2O 3Composition, Gd 2O 3Composition, Y 2O 3Composition and Yb 2O 3The upper limit of content separately in the quality % of oxide compound benchmark, is preferably 10.0%, is 8.0% more preferably, most preferably is 5.0%.Particularly consider, also can contain the La more than 0.1% from the viewpoint of the temperature factor that increases substantially relative refractive index 2O 3Composition.La 2O 3Composition, Gd 2O 3Composition, Y 2O 3Composition and Yb 2O 3Composition can use for example La 2O 3, La (NO 3) 3XH 2O (X is an arbitrary integer), Gd 2O 3, Y 2O 3, Yb 2O 3As raw material.
In addition, for Ln 2O 3Composition (in the formula, Ln be selected among La, Gd, Y, the Yb more than a kind) the quality sum, in the quality % of oxide compound benchmark, the upper limit is preferably 15.0%, more preferably less than 12.0%, most preferably less than 10.0%.Need to prove, though can not contain Ln fully 2O 3Composition, but particularly consider from the viewpoint of the high glass of the temperature factor that can be easy to obtain relative refractive index, for Ln 2O 3The lower limit of the quality sum of composition in the quality % of oxide compound benchmark, is preferably 0.1%, is 0.5% more preferably, most preferably is 1.0%.
TeO 2Composition is the composition of temperature factor that increases substantially the relative refractive index of glass.In addition, be liquidus temperature that reduces glass and deaeration and the clarifying composition that promotes glass melting liquid.But when its content was too much, the liquidus temperature of glass uprised on the contrary.Therefore, for TeO 2The upper limit of the content of composition in the quality % of oxide compound benchmark, is preferably 35.0%, more preferably is 20.0%, and more preferably 10.0%.Particularly consider, can make TeO from the viewpoint that obtains the high glass of anti-increased devitrification resistance 2The content of composition is below 2.9%.Need to prove, though also can not contain TeO 2Composition, but through containing TeO 2Composition, the temperature factor that can obtain relative refractive index is high, liquidus temperature is low and steep few glass.Therefore, for TeO 2The lower limit of the content of composition in the quality % of oxide compound benchmark, is preferably 0.1%, is 0.3% more preferably, most preferably is 0.5%.TeO 2Composition can use for example TeO 2As raw material.
TiO 2Composition is for the temperature factor of the relative refractive index that improves glass and reduce the composition of Abbe number.In addition, also be the composition that reduces the liquidus temperature of glass.But when its content was too much, the liquidus temperature of glass uprised on the contrary, and glass coloring.Therefore, for TiO 2The upper limit of the content of composition in the quality % of oxide compound benchmark, is preferably 10.0%, is 5.0% more preferably, most preferably is 3.0%.TiO 2Composition can use for example TiO 2Deng being contained in the glass as raw material.
ZrO 2Composition raises, improves simultaneously the composition of the temperature factor of relative refractive index for the Abbe number that suppresses glass.In addition, liquidus temperature and the chemical durability that improves glass and the composition of physical strength for reducing glass.But, ZrO 2When the content of composition was too much, the liquidus temperature of glass uprised on the contrary, and second-order transition temperature and yield-point also uprise.Therefore, for ZrO 2The upper limit of the content of composition in the quality % of oxide compound benchmark, is preferably 10.0%, is 5.0% more preferably, most preferably is 3.0%.Need to prove, though also can not contain ZrO 2Composition, but consider ZrO from the temperature factor of the relative refractive index that improves glass and the viewpoint that improves anti-increased devitrification resistance 2The lower limit of the content of composition is preferably 0.1%, is 0.5% more preferably, most preferably is 1.0%.ZrO 2Composition can use for example ZrO 2As raw material.
Nb 2O 5Composition is for the temperature factor of the relative refractive index that improves glass and reduce the composition of Abbe number.In addition, also be the composition that improves the liquidus temperature of glass.But, Nb 2O 5When the content of composition was too much, the liquidus temperature of glass uprised on the contrary, and second-order transition temperature also uprises.Therefore, for Nb 2O 5The upper limit of the content of composition in the quality % of oxide compound benchmark, is preferably 10.0%, is 5.0% more preferably, most preferably is 3.0%.Nb 2O 5Composition can use for example Nb 2O 5As raw material.
Ta 2O 5Composition raises, improves simultaneously the composition of the temperature factor of relative refractive index for the Abbe number that suppresses glass.In addition, also be the composition that improves the liquidus temperature of glass.But, Ta 2O 5When the content of composition was too much, the liquidus temperature and the second-order transition temperature of glass uprised, and the raw materials cost of glass rises significantly.Therefore, for Ta 2O 5The upper limit of the content of composition in the quality % of oxide compound benchmark, is preferably 10.0%, is 5.0% more preferably, most preferably is 3.0%.Ta 2O 5Composition can use for example Ta 2O 5As raw material.
WO 3Composition is for the temperature factor of the relative refractive index that improves glass and reduce the composition of Abbe number.In addition, also be liquidus temperature that improves glass and the composition that reduces second-order transition temperature and yield-point.But when its content was too much, the liquidus temperature of glass uprised on the contrary, and glass coloring.Therefore, for WO 3The upper limit of the content of composition in the quality % of oxide compound benchmark, is preferably 35.0%, is 20.0% more preferably, most preferably is 10.0%.WO 3Composition can use for example WO 3As raw material.
In addition, for opticglass of the present invention, preferred mass sum (Ln 2O 3+ TiO 2+ ZrO 2+ Nb 2O 5+ Ta 2O 5+ WO 3+ TeO 2) be more than 0.1%.Thus, owing to remove Bi 2O 3The composition that also contains the temperature factor that improves relative refractive index outside the composition so can further improve the temperature factor of relative refractive index, improves the anti-increased devitrification resistance of glass simultaneously.Therefore, with respect to being scaled the glass total mass that oxide compound is formed, quality sum (Ln 2O 3+ TiO 2+ ZrO 2+ Nb 2O 5+ Ta 2O 5+ WO 3+ TeO 2) lower limit be preferably 0.1%, be 0.5% more preferably, most preferably be 1.0%.Particularly consider that from the viewpoint of the temperature factor that improves relative refractive index above-mentioned quality sum can be for more than 3.1%.On the other hand, from improving the viewpoint consideration by the anti-increased devitrification resistance of the excessive glass that contains mentioned component and cause, the upper limit of above-mentioned quality sum is preferably 40.0%, is 30.0% more preferably, most preferably is 20.0%.
MgO composition, CaO composition, SrO composition and BaO composition are for through suitably containing the composition of the liquidus temperature that reduces glass.But when the content of these compositions was too much, liquidus temperature uprised on the contrary, and the temperature factor of relative refractive index also reduces.Therefore, the upper limit for the content of MgO composition, CaO composition, SrO composition and BaO composition in the quality % of oxide compound benchmark, is preferably 35.0% respectively, is 25.0% more preferably, most preferably is 15.0%.MgO composition, CaO composition, SrO composition and BaO composition can use for example MgO, MgCO 3, CaCO 3, Sr (NO 3) 2, BaCO 3, Ba (NO 3) 2As raw material.
The ZnO composition is to reduce the liquidus temperature of glass and reduce painted composition.But when the content of ZnO composition was too much, liquidus temperature uprised on the contrary, and Abbe number uprises.Therefore, the upper limit for the content of ZnO composition in the quality % of oxide compound benchmark, is preferably 35.0%, more preferably is 25.0%, and more preferably 15.0%, most preferably be 7.0%.Need to prove,,, the temperature factor of relative refractive index is reduced, improve anti-increased devitrification resistance and reduce painted through containing the ZnO composition though also can not contain the ZnO composition.Therefore, the lower limit for the content of ZnO composition in the quality % of oxide compound benchmark, is preferably 0.1%, is 1.0% more preferably, most preferably is 2.3%.The ZnO composition for example can use ZnO as raw material.
In the opticglass of the present invention, preferred RO composition (R be selected among Mg, Ca, Sr, Ba, the Zn more than a kind) total content be below 40.0%.Thus, can suppress rising by the excessive liquidus temperature that contains mentioned component and cause.Therefore, the upper limit of the total content of RO composition is preferably 40.0%, is 30.0% more preferably, most preferably is 20.0%.Need to prove,,, can improve the anti-increased devitrification resistance of glass through containing the RO composition though also can not contain the RO composition.Therefore, the lower limit for the content of RO composition in the quality % of oxide compound benchmark, is preferably 0.1%, is 1.0% more preferably, most preferably is 2.3%.
In addition, for opticglass of the present invention, preferred mass sum (Ln 2O 3+ Rn 2O+RO) be more than 0.1%.Thus, the anti-increased devitrification resistance of glass can be improved, and painted, the raising transmission of visible light of glass can be reduced.Therefore, with respect to being scaled the glass total mass that oxide compound is formed, quality sum (Ln 2O 3+ Rn 2O+RO) lower limit is preferably 0.1%, more preferably is 1.0%, and more preferably 4.6%, most preferably be 7.0%.On the other hand, consider that from reducing the upper limit of above-mentioned quality sum is preferably 50.0%, is 30.0% more preferably, most preferably is 20.0% by the viewpoint of the excessive glass devitrification that contains mentioned component and cause.
In the opticglass of the present invention, with respect to Bi 2O 3The content of composition, quality sum (Ln 2O 3+ Rn 2O+RO) ratio is preferably more than 0.08.Thus, can reduce the painted raising transmission of visible light of glass.Therefore, be scaled the mass ratio (Ln that oxide compound is formed 2O 3+ Rn 2O+RO)/Bi 2O 3Lower limit be preferably 0.08, be 0.10 more preferably, most preferably be 0.13.Need to prove,, generally be roughly below 0.40, be preferably below 0.30, more preferably below 0.25 for above-mentioned mass ratio.
P 2O 5Composition is the composition of the transsmissivity of raising glass.But, P 2O 5When the content of composition was too much, glass material was difficult to dissolving, and liquidus temperature raises, and the temperature factor of relative refractive index also reduces.Therefore, for P 2O 5The upper limit of the content of composition, in the quality % of oxide compound benchmark, the upper limit is preferably 15.0%, more preferably is 10.0%, most preferably less than 4.0%.P 2O 5Composition can use for example Al (PO 3) 3, Ca (PO 3) 2, Ba (PO 3) 2, Na (PO 3), BPO 4, H 3PO 4As raw material.
GeO 2Composition is the composition of the anti-increased devitrification resistance of raising glass.But, GeO 2When the content of composition was too much, the dissolving property of glass was easy to reduce, and the raw materials cost of glass significantly improves.Therefore, for GeO 2The content of composition, in the quality % of oxide compound benchmark, the upper limit is preferably 10.0%, is 5.0% more preferably, is more preferably less than 3.0%, most preferably less than 1.0%.GeO 2Composition can use for example GeO 2As raw material.
Al 2O 3Composition, Ga 2O 3Composition and In 2O 3Composition is the chemical durability of raising glass or the composition of physical strength.But, Al 2O 3Composition or Ga 2O 3Composition, In 2O 3When the content of composition was too much, the dissolving property of glass was easy to reduce.Therefore, for Al 2O 3The upper limit of the content of composition in the quality % of oxide compound benchmark, is preferably 15.0%, more preferably is 10.0%, and more preferably 5.0%.In addition, for Ga 2O 3Composition and In 2O 3The content separately of composition, in the quality % of oxide compound benchmark, the upper limit is preferably 10.0% respectively, more preferably less than 5.0%, is more preferably less than 3.0%, further preferably less than 0.8%, especially preferably less than 0.5%.Particularly because Al 2O 3Composition is for the composition of the liquidus temperature of reduction glass, so for Al 2O 3The content of composition in the quality % of oxide compound benchmark, is preferably less than 1.0%, more preferably is less than 0.5%, most preferably is less than 0.3%.Al 2O 3Composition and Ga 2O 3Composition can use for example Al 2O 3, Al (OH) 3, Ga 2O 3, Ga (OH) 3As raw material.
Sb 2O 3Composition is for promoting the composition of glass clarifying.But, when its content is too much, the painted grow of glass.Therefore, for Sb 2O 3The upper limit of the content of composition in the quality % of oxide compound benchmark, is preferably 10.0%, is 5.0% more preferably, most preferably is 3.0%.Sb 2O 3Composition can use for example Sb 2O 3, Sb 2O 5, Na 2H 2Sb 2O 75H 2O is as raw material.
Need to prove, make the composition of glass clarifying and deaeration be not limited to above-mentioned Sb 2O 3Composition can use known finings, deaerating agent or their combination in the glass manufacturing field.
For opticglass of the present invention, preferred La 2O 3Composition, Gd 2O 3Composition, Yb 2O 3Composition, GeO 2Composition and Ta 2O 5The quality sum of composition is below 15.0%.Thus, can reduce raw materials cost high rare earth class composition and GeO 2Composition, Ta 2O 5So the usage quantity of composition is can the more cheap high glass of temperature factor of making relative refractive index.Therefore, for being scaled the quality sum (La that oxide compound is formed 2O 3+ Gd 2O 3+ Yb 2O 3+ GeO 2+ Ta 2O 5), the upper limit is preferably 15.0%, more preferably is 10.0%, most preferably less than 7.5%.
Wherein, for opticglass of the present invention, preferred especially GeO 2Composition and Ta 2O 5The quality sum of composition is below 5.0%.Thus, can reduce the high GeO of raw materials cost especially 2Composition, Ta 2O 5The usage quantity of composition is so can make the high glass of temperature factor of relative refractive index more at an easy rate.Therefore, be scaled the quality sum (GeO that oxide compound is formed 2+ Ta 2O 5) the upper limit be preferably 5.0%, more preferably be 2.2%, more preferably 1.7%, most preferably be 1.0%.
In addition, for opticglass of the present invention, preferred TeO 2Composition and Sb 2O 3The quality sum of composition is more than 0.01%.Thus, owing to contain the TeO that promotes glass clarifying 2Composition or Sb 2O 3Composition is so can obtain preferred opticglass in making light transmissive purposes.Therefore, be scaled the quality sum (TeO that oxide compound is formed 2+ Sb 2O 3) lower limit be preferably 0.01%, be 0.10% more preferably, most preferably be 0.30%.On the other hand, for the upper limit of above-mentioned quality sum, generally being roughly below 35.0%, more preferably is below 25.0%, more preferably below 15.0%.
< about the composition that should not contain >
Among the present invention, can in the scope that does not hinder glass performance of the present invention, add other compositions as required.Wherein, Except that Ti, Zr, Nb, Ta, W, La, Gd, Y, Yb; Each transiting metal component such as V, Cr, Mn, Co, Ni, Cu, Ag, Mo, Pr, Nd, Pm, Sm, Eu, Tb, Dy, Ho, Ce, Er, Tm and Lu; Even containing a small amount of respectively individually or containing under a spot of situation, also make glass coloring, the certain wave strong point produces and absorbs in visibility region with complex form.Therefore, opticglass of the present invention does not preferably contain mentioned component in fact.So-called here " not containing in fact ", do not comprise the situation of sneaking into the form of impurity, be not meant and contain artificially.
And then, lead compound and As such as PbO 2O 3Deng arsenic compound and Th, Cd, Tl, Os, Be, each composition of Se; Exist in recent years as harmful chemical and tendency that Be Controlled is used; Not only in glass manufacturing process, even also need the measure aspect the environmental protection in the processing after manufacturing procedure and commercialization.Therefore, under the situation of the influence aspect the attention environment, except that inevitably sneaking into, preferably do not contain mentioned component in fact.
For the glass that preferably uses as opticglass of the present invention; Because being the quality % with the oxide compound benchmark, its composition representes; So be not that direct representation is a mole %; But composition each composition that in satisfying the glass composition of desired various characteristics, exists among the present invention, that utilize mole % to represent in the oxide compound benchmark, is roughly got following value.
Bi 2O 3Composition is 20.0～70.0 moles of %, and
B 2O 3Composition is 12.0～70.0 moles of %
And
SiO 2Composition is 0～60.0 mole of %, and/or
Li 2The O composition is 0～30.0 mole of %, and/or
Na 2The O composition is 0～25.0 mole of %, and/or
K 2The O composition is 0～20.0 mole of %, and/or
La 2O 3Composition is 0～7.0 mole of %, and/or
Gd 2O 3Composition is 0～7.0 mole of %, and/or
Y 2O 3Composition is 0～5.0 mole of %, and/or
Yb 2O 3Composition is 0～7.0 mole of %, and/or
TeO 2Composition is 0～35.0 mole of %, and/or
The MgO composition is 0～60.0 mole of %, and/or
The CaO composition is 0～60.0 mole of %, and/or
The SrO composition is 0～60.0 mole of %, and/or
The BaO composition is 0～50.0 mole of %, and/or
The ZnO composition is 0～60.0 mole of %, and/or
TiO 2Composition is 0～20.0 mole of %, and/or
ZrO 2Composition is 0～20.0 mole of %, and/or
Nb 2O 5Composition is 0～7.0 mole of %, and/or
Ta 2O 5Composition is 0～8.0 mole of %, and/or
WO 3Composition is 0～35.0 mole of %, and/or
P 2O 5Composition is 0～30.0 mole of %, and/or
GeO 2Composition is 0～15.0 mole of %, and/or
Al 2O 3Composition is 0～30.0 mole of %, and/or
Ga 2O 3Composition is 0～10.0 mole of %, and/or
Sb 2O 3Composition is 0～7.0 mole of %
[method of manufacture]
Opticglass of the present invention for example can be made with being described below.That is, above-mentioned raw materials is mixed to evenly makes each composition in the scope of containing ratio of regulation, the mixture of making is put into quartz crucible or golden crucible; In 750 ℃～1000 ℃ TR, carried out fusion 2～3 hours, stirring homogenizes it, begins from the temperature that is reduced to about 850～650 ℃; After about 1 hour; Be cast in the mould, slowly opticglass is made in cooling thus.
< rerum natura >
Opticglass of the present invention has the temperature factor (dn/dT) of high relative refractive index.More specifically, the lower limit of the temperature factor of the relative refractive index of opticglass of the present invention (20～40 ℃) is preferably 3.0 * 10 -6℃ -1, more preferably be 6.0 * 10 -6℃ -1, most preferably be 9.0 * 10 -6℃ -1Thus, when the temperature of optical element uprised, it is bigger that specific refractory power becomes, the imaging deviation of the optical element generation that therefore can be formed by the material of the temperature factor with negative relative refractive index with high-precision correction etc.On the other hand, the upper limit of the temperature factor of the relative refractive index of opticglass of the present invention (20～40 ℃) is preferably 25.0 * 10 -6℃ -1, more preferably be 23.0 * 10 -6℃ -1, more preferably 20.0 * 10 -6℃ -1, most preferably be 15.0 * 10 -6℃ -1When the temperature factor of relative refractive index is excessive, can't proofread and correct by the low imaging characteristic that glass produces etc. that disperses, imaging characteristic etc. are easy to worsen on the contrary.But the temperature factor through making relative refractive index can more suitably be proofreaied and correct the influence that disperses glass that imaging characteristic etc. is produced by low in above-mentioned scope.Here, the temperature factor of so-called relative refractive index among the present invention, for the temperature factor of the airborne specific refractory power (546.07nm) of the same temperature of opticglass, with per 1 ℃ variable quantity (* 10 -6/ ℃) represent.
In addition, opticglass of the present invention painted few is high to the transparency of visible rays.When opticglass particularly of the present invention was represented with the transsmissivity of glass, spectral transmission was 70% wavelength (λ in the sample of thick 10mm 70) be below the 490nm, more preferably be below the 480nm, most preferably to be below the 460nm.In addition, spectral transmission is 5% wavelength (λ 5) be below the 460nm, more preferably be below the 440nm, most preferably to be below the 430nm.Thus, be positioned near the position the ultraviolet region, can improve the transparency of glass, so make opticglass see through visible light, proofreading and correct in the purposes of imaging characteristic etc. of other optical elements preferred the use visible rays through the absorption limit that makes glass.In addition, the absorption of the light of the opticglass when making visible transmission through reduction, the isochronous temperature variation of correcting imaging characteristic diminishes, and therefore, can stably obtain the performance of correcting imaging characteristic etc.
In addition, opticglass of the present invention preferably has high refractive index and high dispersive (low Abbe number).More specifically, the specific refractory power (n of opticglass of the present invention d) lower limit be preferably 1.70, be 1.75 more preferably, most preferably be 1.80.Here, the specific refractory power (n of opticglass of the present invention d) not special qualification of the upper limit, generally be roughly below 2.20, more particularly be below 2.15, more specifically be below 2.10.On the other hand, the Abbe number (v of opticglass of the present invention d) the upper limit be preferably 30, be 28 more preferably, most preferably be 26.On the other hand, for the Abbe number (v of opticglass of the present invention d) not special qualification of lower limit, generally be roughly more than 15, more particularly be more than 17, more specifically be more than 18.Thus, can enlarge the degree of freedom of optical design, and then realize the slimming of element, and obtain big refraction of light amount, can realize the miniaturized that the optics system is whole.Particularly, make the correction of chromatic aberation be easy to carry out, so can realize projector, broadcasting miniaturized and high resolving powerization with optics systems such as equipment, duplicating machine and laser printers through reducing the Abbe number of opticglass.
[preform and optical element]
Opticglass by making adopts for example method such as reheat extrusion forming or precision press formation, can make glass forming body.Promptly; Can make the preform that is used for the mould extrusion forming by opticglass; Above-mentioned preform is carried out the reheat extrusion forming; Carry out attrition process then and make glass forming body, perhaps for example carry out precision press formation, make glass forming body carrying out the preform that attrition process produces.The glass forming body that is formed by opticglass of the present invention for example can be used for optical element purposes such as lens, prism, mirror, and typically can be used for projector and duplicating machine etc. variable is pyritous equipment.Need to prove that the method for making glass forming body is not limited to aforesaid method.
Embodiment
Embodiments of the invention (No.1～No.3) and comparative example (No.A～composition No.D) and the specific refractory power (n of above-mentioned glass d), Abbe number (v d), the temperature factor (dn/dT) of relative refractive index and spectral transmission be 5% and 70% wavelength (λ 5And λ 70) the result be shown in table 1.Need to prove that following examples are not limited in these embodiment all the time for exemplary purposes.
Embodiments of the invention ((make as follows: the high-purity raw of selecting corresponding oxide compound, oxyhydroxide, carbonate, nitrate salt, fluorochemical, oxyhydroxide etc. in opticglass, to use usually respectively as the raw material of each composition for No.1～No.3) and comparative example by the glass of No.A～No.D); Composition according to each embodiment shown in the table 1 and comparative example carries out weighing; Making glass weight is 400g; After mixing, drop in quartz crucible or the golden crucible, according to the fusion complexity of glass composition; Fusion 2～3 hours in 750 ℃～1000 ℃ TR in electric furnace; Stir it is homogenized, begin to be cast to slowly cooling in the mould through after about 1 hour from being reduced to temperature about 850～650 ℃.
Here, embodiment (No.1～No.3) and the comparative example (specific refractory power (n of the glass of No.A～No.D) d) and Abbe number (v d) be based on that the industry of Japanese optics nitre can standard JOGIS01-2003 measures.Need to prove, for the glass that uses in this mensuration, use with slow cooling rate be-25 ℃/hr, glass after in slow cool furnace, handling.
In addition, ((temperature factor (dn/dT) of the relative refractive index of the glass of No.A～No.D) is to utilize the interferometric method in the method that Japanese optics nitre industry can standard JOGIS 18-1994 " measuring method of the temperature factor of the specific refractory power of opticglass " be put down in writing to measure to embodiment for No.1～No.3) and comparative example.
In addition, embodiment ((can measure by standard JOGIS02 according to Japanese optics nitre industry for No.1～No.3) and comparative example by the transsmissivity of the glass of No.A～No.D).Need to prove, among the present invention,, obtain whether painted and degree of glass through measuring glass to visible light transmittance.Particularly,, measure the spectral transmission of 200～800nm of the parallel grinding object in opposite of thick 10 ± 0.1mm, obtain λ based on JISZ8722 5And λ 70(during transsmissivity 5% and 70% o'clock wavelength).
[table 1]
Figure BSA00000712098200191
As shown in table 1, (opticglass of No.1～No.3), the temperature factor of relative refractive index (546.07nm) (20～40 ℃) is 3.0 * 10 for embodiments of the invention -6℃ - 1More than, be 6.0 * 10 more in detail -6℃ -1More than, in desired scope.And for comparative example (No.A), the temperature factor of its relative refractive index is lower than 3.0 * 10 -6℃ -1As stated, as the reason of the temperature factor step-down of relative refractive index in the glass of comparative example (No.A), the glass that can enumerate comparative example (No.A) does not contain Bi 2O 3Composition.Therefore, but the glassy phase of the opticglass of knowledge capital inventive embodiment and comparative example (No.A) is higher than the temperature factor of relative refractive index.
In addition, for the opticglass of embodiments of the invention, λ 70(wavelength during transsmissivity 70%) is below the 490nm, is below the 440nm more in detail.In addition, for the opticglass of embodiments of the invention, λ 5(wavelength during transsmissivity 5%) is below the 460nm, is below the 400nm more in detail.And the λ of comparative example (No.B, No.D) 70Be higher than 490nm, take place painted.In addition, because comparative example (No.C) devitrification, so visible light is not shown transmissivity.As producing painted reason in the glass of comparative example (No.B, No.D) as stated, the alkali-metal content of glass that can enumerate comparative example (No.B, No.D) is many.In addition, as the reason of the glass generation devitrification of comparative example (No.C), the glass that can enumerate comparative example (No.C) neither contains alkaline-earth metal and does not also contain the ZnO composition.Therefore, but (transmissivity of the glassy phase comparison visible light of No.B～No.D) is high for the opticglass of knowledge capital inventive embodiment and comparative example.
In addition, the specific refractory power (n of the opticglass of embodiments of the invention d) be more than 1.70, be more than 1.85 more in detail, in desired scope.In addition, the Abbe number (v of the opticglass of embodiments of the invention d) be below 30, be below 20 more in detail, in desired scope.
Therefore, but the specific refractory power (n of the opticglass of knowledge capital inventive embodiment d) and Abbe number (v d) in desired scope, the temperature factor of relative refractive index (dn/dT) is high and painted few.Can infer that thus the opticglass of embodiments of the invention helps the miniaturized of optics systems such as projector, and can be preferred for proofreading and correct the purposes of imaging deviation of in the optical element that the material big by Abbe number forms, producing etc.
And then, use the opticglass of embodiments of the invention, form attrition process and carry out grinding and grinding after with preform, be processed as lens and prismatical shape.In addition, use the opticglass of embodiments of the invention, form precision press formation and use preform, precision press formation is carried out precision press formation processing with preform, be processed as lens and prismatical shape.Under above-mentioned any situation, all can be processed into desired lens and prismatical shape.
The present invention below at length has been described for exemplary purposes, but present embodiment is appreciated that under the situation that does not break away from design of the present invention and scope, carrying out multiple change to those skilled in the art all the time just for exemplary purposes.

Claims (26)

1. opticglass in respect to the quality % that is scaled the total mass that oxide compound forms, contains 55.0～95.0%Bi 2O 3Composition and 4.0～35.0%B 2O 3Composition, the temperature factor of relative refractive index (546.07nm) (20～40 ℃) is 3.0 * 10 -6(℃ -1) more than, spectral transmission is 70% wavelength (λ 70) be below the 490nm.
2. opticglass as claimed in claim 1, wherein, the temperature factor of relative refractive index (546.07nm) (20～40 ℃) is 6.0 * 10 -6(℃ -1) more than.
3. opticglass as claimed in claim 1, wherein, in the quality % with respect to the total mass that is scaled the oxide compound composition, SiO 2The content of composition is below 35.0%.
4. opticglass as claimed in claim 1 wherein, is scaled the mass ratio (SiO that oxide compound is formed 2/ B 2O 3) less than 0.3.
5. opticglass as claimed in claim 1, wherein, in quality % with respect to the total mass that is scaled the oxide compound composition,
Li 2The content of O composition is 0～8.0%, and/or
Na 2The content of O composition is 0～8.0%, and/or
K 2The content of O composition is 0～8.0%.
6. opticglass as claimed in claim 5, wherein, with respect to being scaled the glass total mass that oxide compound is formed, Rn 2The quality sum of O composition is below 15.0%, Rn 2Rn among the O be selected among Li, Na, K, the Cs more than a kind.
7. opticglass as claimed in claim 1, wherein, in quality % with respect to the total mass that is scaled the oxide compound composition,
La 2O 3The content of composition is 0～10.0%, and/or
Gd 2O 3The content of composition is 0～10.0%, and/or
Y 2O 3The content of composition is 0～10.0%, and/or
Yb 2O 3The content of composition is 0～10.0%.
8. opticglass as claimed in claim 7, wherein, with respect to being scaled the glass total mass that oxide compound is formed, Ln 2O 3The quality sum of composition is below 15.0%, Ln 2O 3In Ln be selected among La, Gd, Y, the Yb more than a kind.
9. opticglass as claimed in claim 1, wherein, in the quality % with respect to the total mass that is scaled the oxide compound composition, TeO 2The content of composition is below 35.0%.
10. opticglass as claimed in claim 1, wherein, in quality % with respect to the glass total mass that is scaled the oxide compound composition,
TiO 2The content of composition is 0～10.0%, and/or
ZrO 2The content of composition is 0～10.0%, and/or
Nb 2O 5The content of composition is 0～10.0%, and/or
Ta 2O 5The content of composition is 0～10.0%, and/or
WO 3The content of composition is 0～35.0%.
11. opticglass as claimed in claim 10, wherein, with respect to being scaled the glass total mass that oxide compound is formed, Ln 2O 3+ TiO 2+ ZrO 2+ Nb 2O 5+ Ta 2O 5+ WO 3+ TeO 2The quality sum be more than 0.1% below 40.0%.
12. opticglass as claimed in claim 1, wherein, with respect to being scaled the glass total mass that oxide compound is formed, in quality %,
The content of MgO composition is 0～35.0%, and/or
The content of CaO composition is 0～35.0%, and/or
The content of SrO composition is 0～35.0%, and/or
The content of BaO composition is 0～35.0%, and/or
The content of ZnO composition is 0～35.0%.
13. opticglass as claimed in claim 12, wherein, with respect to being scaled the glass total mass that oxide compound is formed, the quality sum of RO composition is below 40.0%, the R among the RO be selected among Mg, Ca, Sr, Ba, the Zn more than a kind.
14. opticglass as claimed in claim 1, wherein, with respect to being scaled the glass total mass that oxide compound is formed, Ln 2O 3, Rn 2The quality sum of O and RO is more than 0.1%.
15. opticglass as claimed in claim 1 wherein, is scaled the mass ratio (Ln that oxide compound is formed 2O 3+ Rn 2O+RO)/Bi 2O 3Be more than 0.08.
16. opticglass as claimed in claim 1, wherein, with respect to being scaled the glass total mass that oxide compound is formed, in quality %,
P 2O 5The content of composition is 0～15.0%, and/or
GeO 2The content of composition is 0～10.0%, and/or
Al 2O 3The content of composition is 0～15.0%, and/or
Ga 2O 3The content of composition is 0～10.0%, and/or
Sb 2O 3The content of composition is 0～10.0%.
17. opticglass as claimed in claim 1, wherein, with respect to being scaled the glass total mass that oxide compound is formed, Ta 2O 5+ GeO 2The quality sum be below 5.0%.
18. opticglass as claimed in claim 1, wherein, with respect to being scaled the glass total mass that oxide compound is formed, TeO 2+ Sb 2O 3The quality sum be more than 0.01%.
19. opticglass as claimed in claim 1, wherein, specific refractory power (nd) is more than 1.70 below 2.20, and Abbe number (vd) is more than 15 below 30.
20. a preform that is used for attrition process and/or is used for precision press formation is formed by each described opticglass in the claim 1 to 19.
21. an optical element grinds and forms the described preform of claim 20.
22. an optical element carries out precision press formation and forms the described preform of claim 20.
23. an optical element is formed by each described opticglass in the claim 1 to 19.
24. an optical device has the described optical element of claim 21.
25. an optical device has the described optical element of claim 22.
26. an optical device has the described optical element of claim 23.
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